Rudstone

2. Rudstone/packstone

Grain-supported with carbonate mud matrix between grains; more than 10% of grains is > 2 mm. Skeletal grains include upper Cretaceous inoceramid bivalve prismatic shell, planktonic foraminifera and crinoids.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

3. Rudstone/grainstone

Grain-supported with cement (calcite spar) between grains; skeletal grains (Chaetetes calcareous sponge), intraclasts and peloids are abraded, with micrite envelopes and re-worked; more than 10% of grains is > 2 mm. The thin section is stained with alizarin red.

High Atlas, Morocco, cf. Merino-Tome' et al. (2012), Della Porta et al. (2013)

4. Rudstone/grainstone

Grain-supported with cement (isopachous rims of marine radial fibrous cement and calci-mudstone as internal sediment of interparticle porosity) between grains; skeletal grains (coral fragments, calcareous sponges) are re-worked from a reef belt at platform margin; more than 10% of grains is > 2 mm.

High Atlas, Morocco, cf. Merino-Tome' et al. (2012), Della Porta et al. (2013)